Functional requirements are the result of an engineering process of identifying the specific functions that a materiel or software system must do in order to meet the need identified by the user.
Functional requirements identify mission (e.g. move, shoot, communicate) and maintenance and support (e.g. transport, maintain, dispose) functions that must be performed for each system/equipment alternative in the intended environment. Functional requirements translate into mission hardware/software and support system requirements. During the Technology Development Phase, functional requirements are refined to a greater level of detail and hardware/software are identified that meet the functional requirements
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